Web-Comic Script

[edenwax]

Alright, so I've been working on and off on a web comic script for quite some time and I'm seriously stumped.

The way I have it set up, I can't find an efficient way to hide the "next" comic nav link when the next comic id doesnt exist.

For example index.php?comic=3 exists, and index.php?comic=4 doesnt. On comic=3 I want the "next" link to be hidden.

[Nick]

Is this in PHP? This code you have to manually set the limit for. I didn't test it, but see if this works:


<?php
$current = $_GET['comic'];
$limit = "3";
$nextlink = "<a href=\"/index.php?comic=".$current++."\">Next</a>";
$previouslink =  "<a href=\"/index.php?comic=".$current-1."\">Previous</a>";

function links {
   if($current <= '0') {
       echo $nextlink;
   }
   if($current >= $limit) {
       echo $previouslink;
   }
   else {
       echo $nextlink." | ".$previouslink;
   }
}

if($current == '1') {
   // SHOW FIRST COMIC
}
if ($current == '2') {
   // SHOW SECOND COMIC
}
if($current=='3'){
   // SHOW THIRD COMIC
}
links();
?>


[edenwax]

Well to prevent overly huge code, I use databases. So the author can upload the comic title, date, description and comic in one form. If you want I can send you the code, its a mess of failed experiments, but you may be able to help.

[Nick]

Sure. I'd be easier to work with if I could see how it worked.

[(/iPokemon/)]

I have an awesome PHP Pagination class I found somewhere that could be of use to you. I'm using it on my Game's forum that I coded


<?php
class pageMe
{
public function __construct()
{
}
public function calculate_pages($total_rows, $rows_per_page, $page_num)
{
$arr = array();
// calculate last page
$last_page = ceil($total_rows / $rows_per_page);
// make sure we are within limits
$page_num = (int) $page_num;
if ($page_num < 1)
{
  $page_num = 1;
}
elseif ($page_num > $last_page)
{
  $page_num = $last_page;
}
$upto = ($page_num - 1) * $rows_per_page;
$arr['limit'] = 'LIMIT '.$upto.',' .$rows_per_page;
$arr['current'] = $page_num;
if ($page_num == 1)
$arr['previous'] = $page_num;
else
$arr['previous'] = $page_num - 1;
if ($page_num == $last_page)
$arr['next'] = $last_page;
else
$arr['next'] = $page_num + 1;
$arr['last'] = $last_page;
$arr['info'] = 'Page '.$page_num.' of '.$last_page;
$arr['pages'] = $this->get_surrounding_pages($page_num, $last_page, $arr['next']);
return $arr;
}
function get_surrounding_pages($page_num, $last_page, $next)
{
$arr = array();
$show = 5; // how many boxes
// at first
if ($page_num == 1)
{
// case of 1 page only
if ($next == $page_num) return array(1);
for ($i = 0; $i < $show; $i++)
{
if ($i == $last_page) break;
array_push($arr, $i + 1);
}
return $arr;
}
// at last
if ($page_num == $last_page)
{
$start = $last_page - $show;
if ($start < 1) $start = 0;
for ($i = $start; $i < $last_page; $i++)
{
array_push($arr, $i + 1);
}
return $arr;
}
// at middle
$start = $page_num - $show;
if ($start < 1) $start = 0;
for ($i = $start; $i < $page_num; $i++)
{
array_push($arr, $i + 1);
}
for ($i = ($page_num + 1); $i < ($page_num + $show); $i++)
{
if ($i == ($last_page + 1)) break;
array_push($arr, $i);
}
return $arr;
}
}
?>


Use it like this:


$page = (isset($_GET["comic"])) ? $_GET["comic"]:1;
$sql = mysql_query("SELECT * FROM `table`");
$pagination = new pageMe();
$links = $pagination->calculate_pages(mysql_num_rows($sql),1,$page); //total number of rows, how many per page, current page


And if you were to var_dump $links, this is something you'd get:



Array

(

   [limit] => LIMIT 0,10

   [current] => 1

   [previous] => 1

   [next] => 2

   [last] => 7

   [info] => Page (1 of 7)

   [pages] => Array

       (

           [0] => 1

           [1] => 2

           [2] => 3

           [3] => 4

           [4] => 5

       )

)


So.. use it like $links["limit"] in your mysql_query to limit the number of rows displayed, $links["pages"] as a foreach() or just show first and last page link

[Nick]

Sorry, forgot to post that we figured it out! Thanks iPokemon!

[Nero Yami (banned)]

hehe very comical indeed!

[(/iPokemon/)]

Aug 7, 2011 19:38:15 GMT Nero Yami (banned) said:

hehe very comical indeed!

Yea, that's just hilarious.

Yea, np, just thought I'd share.

[robert (banned)]

haha

[taz]

Wow that is some nice coding. Are you intending to make it a downloadable software?